back projection


Also found in: Acronyms.
Related to back projection: Rear Projection

back projection

n
(Film) a method of projecting pictures onto a translucent screen so that they are viewed from the opposite side, used esp in films to create the illusion that the actors in the foreground are moving. Also called: background projection
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An iterative methods such as Algebraic Reconstruction Technique (ART) and analytical Fourier methods such as Filtered Back projection (FBP) have been considered by several applications.
Back projection technique redistributes the number of counts at each particular point back along a line from which they were originally detected.
Then, the tomographic processing called back projection is presented to get SAR image by combining the backscattering data calculated by using PILE + FB.
In the traditional signal processing methods [5-10], the information of the ground surface is treated as clutters or noise to be canceled, for example, the optimal time-domain detection [5], the iterative frequency-domain clutter reduction [6], hidden Markov models for target classification [7], the ultrawide-band synthetic aperture radar (SAR) processing [8,9] and traditional Back Projection (BP) method [10], etc.
Musion, the company that has installed these back projection systems at Manchester Airport, calls them 'holograms'.
A key requirement of the filtered back projection reconstruction algorithm typically used by CT is for the set of 2-D images to represent a full 360[degrees] rotation of the object relative to the source and detector.
n In the space of four evenings, I saw Bromsgrove Operatic Society (Carousel) and The Nonentities, of Kidderminster (Ladies Down Under), using back projection instead of cumbersome sets.
When Anne arrives, she is seen driving against a back-projection of London streets, but with back projection used throughout, the inference is obscure.
Using a video back projection, scene changes were achieved with speed and some fun, familiar scenes arriving on the back wall while props were pushed in from the wings.
Back projection, used to make it look as if cars were actually moving, often got stuck and Colin Welland remembered having to step nonchalantly from a car that was apparently travelling at 60mph.
It is composed of three walls of structured plastic sheeting illuminated from behind, and a multi-media wall for back projection.